Mechanical lifting mechanism for dump trucks



Filed April 7. 195o MECHANICAL LIFTING MECHANISM FOR DUMP TRUCKS 3 Sheets-Sheet 1 Mlm Inventor @B5/Pra 8551? Aztomey May 12, 1953 R. c. BEST MECHANICAL LIFTING MECHANISM FOR DUMP TRUCKS 3 Sheets-Sheet 2 Filed April 7, 1950 Inventor IMBERT C. B55 7 E mm. .QN RN R. c. BEST 2,638,380

MECHANICAL LIFTING MECHANISM FOR DUMP TRUCKS 5 Sheets-Sheet 5 M ay 12, 1953 Filed April 7, 1950 Inventor Patented May 12, `1953 -MECHANICAL LIFTING Vll/IECHANISNI FOR .DUMP TRUCKS 'Robert -C. Best, Indianapolisflnd. v'Amalicatirm April 7, 1950, Serial No. 154,600

6 Claims.

The present invention relates to alineclfianical lifting mechanism for ydump trucks and it consists in the combinations,constructions andarrangements of parts herein described and claimed. y

Generally there is .provideda .mechanical lift for dump trucks wherein there is `provided a chassis to which is piv-otally connected vat .one end a bed frame of the body. Pivotallyconnected to the chassis yis an elongated vcylinder reciprocable therein which piston is provided with a rod which extends through thefree end of the cylinder to connect with novel links and leverage which are, in turn, connected with the body frame. A cable is entrained over pulleys carried by the piston and .cylinderand `one lend of the cable is aiiixed to thechassis while the `other end is entrained .over a drum which is motivated by means of a winchwhich is, in turn, moved by a shaft connected with a source of power. The shaft is provided with ai `brake which may be controlled by the operator.

lt is accordingly an object of the invention to provide an apparatus of the character setforth which is simple in construction, comparatively inexpensive to manufacture, and yet effective and efficient in use.

Another object of the invention is the provision of novel means for transmitting motion between a source of power associated `with a chassis and a dump truck body frame pivotally connected to such chassis. i

'Another object of the invention is the provision of novel means for guiding a rod utlizedin the invention.

A still further object or" the inventionjis-the provision of a novel arrangement of links and levers forming a part of the invention.

Other and further objects of theinvention will become apparent from a reading .lof the rfollowing,r specification taken in conjunction with the drawings, in which:

Figure 1 is a kplan view of an embodiment,- of the invention,

Figure 2 is a side elevational view ci Figure l,

Figure 3 is a sectionalview taken-substantially along line 3-3 of Figure l,

Figure 4 is a view similar tolFigure, 3 but showing certain partsof theinvention advanced to other positions,

Figure 5 is an enlarged fragmentary horizontal sectional kView illustrating certain details of 3construction,

Figure 6 is a sectional viewtaken -alongline thereof.

,2 Figure' is a fragnlentary perspective view illustrating-certainlinks andlevers utilized in the invention.

Referring more particularly to the drawings,

"there is shown therein -a chassis having side lpieces Hl, end pieces 'H and provided `with axles l2 and supporting wheels '43,*the chassis being vrectangular in shape.

A body supporting frame is provided and consists of la pair of elongated side'members lli interconnected by end members t5 -at either end Each ofthe side members 'i4 is formed with a dependent'ear ift adjacent'the rear end v4thereof and each 'of the ears i6 is pivotaliy connected 4by means of a pin il to `one of the respective sides l@ ofthe chassis.

*journal 23 lin" vv1r1'ich 'is slida'bly mounted a piston rod 24 'the forward end of which has kfor-med thereon 'alpistonf't which is -slidablewithin Vthe cylinder" 29.

Therearward end lof the vrod .24 has affixed thereto a laterally .extending web .28 the `rearward end of Whichis welded :or otherwise ai'xed llto :a transversely :extending cylindrical member :2l which is, iinfturn,:revolubly mounted uponsa vshaft 28 which is Iaixed at either end to the upper corner of a triangular plate 29 each of Whose lower rearward corners is pivotally `:mounted yupon a transversely extending shaft 3l?y affixed to the sides of the chassis.

A link V3l interconnects-.the forward vlower corner of theplate 29, asindicated at .32, with the .adjacent side i4 of the frame, as indicated at 33.

A cable .34 is .anchored Iat one of its ends to the cross bar I8 of the chassis, as indicated at 35, and extends thence rearwardly to a :sheave 3B mounted upon Va shaft 3l `which extends verticalv1y across an opening 38 `found inv one side of the rear wall 22 of the cylinder 20. VThe cable 34 then extends -forwardly through `an opening '3 9 inthe piston 25 to a pulley '4t carried upon L'the forward side ofthe piston and thence through an opening '41 Vin vthe piston to a pulley "42 carried centrally onthe 'forward side of the rear Wall`.22 of the cylinder 20. It thence extends rearwardly through anopening 43 over :a pulley 'M carried en the forward side of the piston 25 and thence rearwardly "through'an opening 15 in the piston 25 to and over a pulley 46 mounted upon a shaft 4l which extends vertically across an opening 48 in the rear wall 22 of the cylinder 20. The cable 34 then extends forwardly through an opening 49 in the cross bar I8 to a drum 58.

The `drum 50 is afxed to ya shaft 5I which extends through a pair yof bracket arms 52 carried by the cross bar IB and thence through a gear housing '53 whose base 54 inter-connects the cross bars IB and i9.

The shaft has affixed thereto within the housing 53 a bevel gear 55 which is enmeshed with a bevel gear 56 likewise mounted within the housing 53 and carried at the rearward end of the shaft 51 which is, in turn, connected by a coupling 58 with a suitable source of power. The shaft 51 carries a brake drum 59 with which is :associated 1a brake band 60 `operable from a, remote point by means of a control rod '61. A bracket V$2 supports the brake mechanism.

In operation, it will be apparent that normally the body supporting frame will lie in a horizontal position, as indiciated, for example, in Figure 3 of the drawings. When, however, it is desired to tilt the frame land its accompanying body (not shown), it is only necessary to supply power, through the connection 53 to the shaft 51 to thereby turn the same, which action will, through the gears 56 and 55, act to revolve the shaft 5l and consequently the drum 50 to thus wind the cable 34 upon suchA drum.

'Since the cable 34 is anchored to the cross bar I8 at 35, such action will cause the piston and consequently the rod 24 to be drawn in a rearward direction thus, through the agency of the web 2B and its tubular connection 2l with the shaft 28 causing the plates 28 to revolve in a counterclockwise direction -upon the shaft 30 as viewed, for example, in Figures 3 and 4. As a result of this action the forward end of the plates 29 will be caused to rise thus, through the associated links 3| causing the frame likewise to be ylifted :and revolved upon its pivotal connections I1, also as viewed f-or example, in Figures 3 and 4.

It will `be seen that that portion of the cable 34 which is affixed at 35 will act to balance the strain put upon the piston 25 by the remainder of the cable 34 when the same is wound upon the drum 50. It will also be seen that the piston 25, the journal 23, and the pulleys 4D, 42, and 44 will act together to maintain the rod 24 in constant parallel relation with the walls of the cylinder 20.

When the body supporting frame has been lifted to a desired height, the operator of the apparatus may, through the use of the conventional control rod @i cause the brake bands to contract up-on the brake ydrum 59 to thereby Istop any further motion. It will also be apparent that when it is desired to return the body supporting -f-rame to its original position, that it is only necessary to cease any application of power to the shaft 5l and to then allow the same to be lowered by gravity, the brake 59-Ell being utilized to control such downward movement of the frame to thereby avoid any breakage of the various parts of the apparatus which might otherwise occur.

While but one form of the invention has been shown and described herein, it will be readily apparent to those skilled in the art that many minor modifications may be made herein without departing from the spirit `of the invention or the scope of the appended claims.

What is claimed is: 4 Y

1. An apparatus of the character described comprising a chassis of rectangular construction, a body-supporting frame likewise of rectangular construction pivotally connected at its rear end to the rear o-f said chassis, a cylinder centrally hinged to said chassis for vertical movement, a piston rod exten-ding rearwardly through the free end of the cylinder, a piston 'affixed to the inner end of the rod and slidable within the cylinder, a sheave mounted at either side of the free end of the cylinder, a sheave mounted at either side of the forward face of the piston, a sheave centrally mounted upon the inner face of the free end wall of the cylinder, a winch mounted upon said chassis, a cable anchored to said chassis at `one end, entrained over said sheaves yand connected to said winch at its other end, linkage and levers connecting the outer end of the rod, said chassis and said frame, and a source of power for turning said winch whereby, when said cable is wound thereon, an outward thrust is given said piston and said piston rod.

2. An apparatus of the -character described comprising a chassis of rectangular construction, a body-supporting frame likewise of rectangular construction pivotal-ly connected at its rear end to the rear of Said chassis, a cylinder centrally hinged to said chassis for vertical movement, a piston rod extending rearwardly through the free end of the cylinder, a piston affixed to the inner end of the rod and slidable within the cylinder, a sheave mounted at either side of the free end :of the cylinder, a sheave mounted at either side of the forward face of the piston, a sheave centrally mounted upon the inner face of the free end Wall of the cylinder, a winch mounted upon sai-cl chassis, a cable anchored to said chassis at one end, entrained over said sheaves and connected to said winch at its other end, linkage and `levers connecting the outer end of the i'od, said chassis and said frame, a source of power for turning said winch whereby, when said cable is wound thereon, an outward thrust is given said piston and said piston rod, a shaft connecting `said winch with said source of power, and a brake for said shaft.

3. An apparatus of the character described comprising a chassis of rectangular construction, a body-supporting frame likewise of rectangular construction pivotally connected at its rear end to the rear 0f said chassis, a cylinder centrally hinged to said chassis for vertical movement, a piston rod extending rearwardly through the free end of the cylinder, a piston affixed to the inner end of the rod and slidable within the cylinder, a sheave mounted at either side of the free end of the cylinder, a sheave mounted at either side o-f the forward face of the piston, a sheave centrally mounted upon the inner face of the -free end wall of the cylinder, a winch mounted upon said chassis, a cable anchored to said chassis at one end, entrained over said sheaves and connected to said winch at its other end, linkage and levers connecting the outer end of the rod, said chassis and said frame, and a source of power for turning said winch whereby, when said cable is wound thereon, an outward thrust is given said piston and said piston rod, said linkage and levers comprising a pair `of vertically extending triangular plates each having its rearward lower corner pivoted to one side of said chassis, ra link 'interconnecting the forward lower corner of said plate with one side of said frame, a transverse shaft interconnecting the upper corner of each plate, a tubular member revoluble upon said shaft and 'a web centrally aixed to said tubular member and to said rod.

4. An apparatus of the character described comprising a chassis of rectangular construction, a body-supporting frame likewise of rectangular construction pivotally :connected at its rear end to the rear of said chassis, `a cylinder centrally hinged to said chassis for vertical movement, a piston rod extending rearwardly through the free end of the cylinder, a piston afiixed to the inner end of the rod and slidablc within the cylinder, ia sheave mounted at either side of the free end of the cylinder, a sheave mounted 'at either side of the forward face of the piston, a sheave centrally mounted upon the inner face of the free end wall of the cylinder, a winch mounted upon said chassis, a cable anchored to sai-d chassis at one end, entrained over said sheaves and connected to said winch at its other end, linkage and levers connecting the outer end of the rod, said chassis and said frame, a source of power for turning said winch whereby, when Isaid cable is wound thereon, an outward thrust is given said piston Aand said piston rod, and a shaft interconnecting said winch with said source of power, and a brake for sai-d shaft, said :linkage and levers comprising a pair of vertically extending triangular plates each having its rearward lower corner pivoted to one side of said chassis, a link interconnecting the forward lower corner of said plate with one side of said frame, a transverse shaft interconnecting the upper corners of said plates, a tubular member revoluble upon said transverse shaft, and a web centrally affixed to said tubular member and to said rod.

5. An apparatus of the character described comprising a chassis of rectangular construction, a body-supporting frame likewise of rectangular construction pivotally connected at its rear end to the rear cf said chassis, a cylinder :centrally hinged to said chassis for vertical movement, a pist-on rod extending rearwardly through the free end of the cylinder, a piston affixed to the inner end of the rod and slidable within 'the cylinder, a sheave mounted at either side of the free end of the cylinder, a sheave mounted at either side of the forward face of the piston, a sheave centrally mounted upon the inner face 'of the free end wall of the cylinder, a winch mounted upon said chassis, a cable anchored to said chassis iat one end, entrained over said sheaves and connected to ysaid winch at its other end, linkage and levers connecting the outer end of the rod, said chassis `and said frame, and a source of power for turning 'said winch, whereby, when said cableV is wound thereon, an outward thrust is given said piston `and said piston rod, said linkage and levers comprising a pair of vertically extending triangular plates each having its rearward lower corner pivoted to one side of said chassis, la link interconnecting the 6 -forward lower corner of said plate with one side of said frame, a transverse shaft interconnecting the upper corner of each plate, a tubular member revoluble upon said transverse shaft,

land a web centrally aixed to said tubular member and said rod, and said web being in the form of an isosceles triangle `and having its base formed integrally with said tubular member and its apex portion aiiixed to said tube.

6. An yapparatus of the character described comprising a chassis of rectangular construction, a body-supporting frame likewise of rectangular construction -pivotally connected at its rear end to the rear of said chassis, a cylinder centrally hinged to said chassis for vertical movement, a piston rod extending rearwardly through the free end Iof the cylinder, a piston affixed to the inner end of the rod yand slidable within the cylinder, a sheave mounted at either side of the free end of the cylinder, a sheave mounted at either side of the forward face of the piston, a sheave `centrally mounted upon the inner face of the free end wall of the cylinder, a winch mounted upon said chassis, a cable yanchored to said chassis at one end, entrained over said sheaves and connected to said winch at its other end, linkage land levers connecting the outer end of the rod, `said chassis and said frame, a vsource of power for turning said winch whereby, when said cable is wound thereon, an outward thrust is given said piston and said piston rod, a shaft interconnecting said winch with `said source of power, Iand a brake for said shaft, said linkage land levers vcomprising a pair of vertically extending triangular plates each having its rearward lower corner pivoted to one side of said chassis, a link interconnecting the forward lower corner of said plate with one side of said frame, a transverse shaft interconnecting the upper corners of the plates, a tubular member revoluble upon said transverse shaft, `and a web centrally aixed to said tubular member and to said rod, said web being formed in the vshape of an isosceles triangle having its base formed integrally with said tubular member and its vapex portion aixed to said rod. y

ROBERT C. BEST.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 897,581 Brown Sept. 1, 1908 900,979 Brown oct. 13, 1908 2,137,045 Day Nov. 15, 1938 2,482,406 Findley Sept. 20,- 1949 2,496,350 Lundell Feb. '7, 1950 2,517,933 Schonrock Aug. 8, 1950 FOREIGN PATENTS Number Country Date 22,335 Australia of 1929 

